CN107991165A - A kind of cement sheath gas tightness failure determination methods - Google Patents
A kind of cement sheath gas tightness failure determination methods Download PDFInfo
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- CN107991165A CN107991165A CN201711071432.1A CN201711071432A CN107991165A CN 107991165 A CN107991165 A CN 107991165A CN 201711071432 A CN201711071432 A CN 201711071432A CN 107991165 A CN107991165 A CN 107991165A
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- 239000004568 cement Substances 0.000 title claims abstract description 157
- 238000000034 method Methods 0.000 title claims abstract description 60
- 230000035699 permeability Effects 0.000 claims abstract description 45
- 238000011068 loading method Methods 0.000 claims abstract description 36
- 238000002474 experimental method Methods 0.000 claims abstract description 19
- 238000004364 calculation method Methods 0.000 claims abstract description 15
- 238000012360 testing method Methods 0.000 claims description 16
- 230000035772 mutation Effects 0.000 claims description 11
- 238000004088 simulation Methods 0.000 claims description 8
- 125000004122 cyclic group Chemical group 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000006378 damage Effects 0.000 abstract description 9
- 238000007796 conventional method Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 208000014674 injury Diseases 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000002343 natural gas well Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000013530 defoamer Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 238000007363 ring formation reaction Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- General Physics & Mathematics (AREA)
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- Dispersion Chemistry (AREA)
- Fluid Mechanics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a kind of cement sheath gas tightness failure determination methods, comprise the following steps：Determine gas tightness failpoint；Calculate cement sheath actual loading situation；Result of calculation and experimental result are contrasted, judge whether cement sheath stress exceedes its gas tightness failpoint；Determine Behavior of Hardened Cement Paste overstrain value；Wellbore pressure change procedure is simulated, calculates cement sheath actual loading situation, and cement sheath overstrain situation after pressure break；Result of calculation and experimental result are contrasted, judge whether gas tightness is safe.The judgment criteria that the present invention fails Behavior of Hardened Cement Paste damage and permeability variation as its hermetic seal, add unloading ess-strain experiment using three axis, permeability is monitored, obtains variation characteristic of the permeability with ess-strain, it is aided with acoustic emission monitor(ing), Behavior of Hardened Cement Paste internal structure change is monitored.This method is more accurate than conventional method, and performance and formula design to cement sheath, the guidance of live wellbore operations are safer.
Description
Technical field
The present invention relates to oil drilling technical field, particularly a kind of cement sheath gas tightness failure determination methods.
Background technology
At present, the research failed for the leakproofness of cementing concrete ring focuses primarily upon destruction and the cement of Behavior of Hardened Cement Paste body
The failure of ring and stratum and casing cement plane, and it is less for Behavior of Hardened Cement Paste damage and the research of permeability variation, it result in scene
Some wells it is intact in cement sheath and in the case that bonding quality is good the still empty phenomenon with pressure of initial ring without method interpretation.
Petroleum and natural gas well is intended to deep-well, ultradeep well, and more and more general similar to staged fracturing, the operation of volume fracturing
Time, cementing concrete ring form loaded also becomes increasingly complex, and the probability that cement sheath is damaged also significantly improves, the wind of seal failure
Danger also greatly increases, the especially natural gas well, often occur cementing quality it is good in the case of well head still annular space is with pressure existing
As, under the conditions of especially extensive hydraulic fracturing and staged fracturing underground cyclic loading and unloading, Behavior of Hardened Cement Paste is not reaching to peak strength,
The permeability variation of Behavior of Hardened Cement Paste, also results in the failure of cement sheath gas tightness.
The operations such as casing pressure test, drilling fluid density change, pressure break make it that cement sheath is complicated in terms of stand under load, in various load
Under effect, the gas tightness of cement sheath can rely solely on intensity and bonding quality to judge, the permeability of Behavior of Hardened Cement Paste with
It is change loading procedure, and the permeability of cement sheath increases the seepage channel to form fluid, fluid-channeling channel can be formed when serious,
Cause cement sheath sealing performance to fail, or even cause scrapping for well head.The increase of Behavior of Hardened Cement Paste permeability is related to its degree of injury,
Therefore, evaluating the sealing performance of cement sheath must be introduced into Behavior of Hardened Cement Paste damage and infiltrative change and.
The Chinese invention patent of Application No. 201611132395 discloses a kind of cementing concrete ring seal and is surveyed every ability dynamic
Trial assembly is put and experimental method.The device includes workbench and test subject, and workbench has computer, and test subject is up and down
Kettle cover, middle part are autoclave body, by the outer and interior structure for being followed successively by simulated formation-cement sheath-casing in autoclave body, are inserted with casing solid
Cylinder, kettle cover have strainer and eccentric mounting with stratum-cement sheath-box face contact portion.This method includes：Prepare cement
Slurry, pours into annular space；Hou Ning, maintenance hardening cyclization；Change temperature, pressure, the radial displacement of test suite pipe and simulation in casing
Stratum is circumferentially displaced, and cement sheath seal failure situation is monitored by sonic test curve；The interior microcrack produced of detection cement sheath,
The microannulus produced at one second interface, analyzes cement sheath seal failure form.The inventive principle is reliable, easy to operate, but should
Invention only considers that cement sheath produces the situation of crack and second interface failure, does not account for the influence of Behavior of Hardened Cement Paste body permeability,
It is not comprehensive enough in evaluation cement sheath integrality aspect.
The content of the invention
For above-mentioned cement sheath existing in the prior art failure evaluation method it is not comprehensive enough the problem of, the present invention provides a kind of
Cement sheath gas tightness failure determination methods, the present invention comment Behavior of Hardened Cement Paste damage and permeability variation as what its hermetic seal was failed
Sentence standard, to determine whether cement sheath can occur gas tightness failure, add unloading ess-strain experiment using three axis, to permeability
Be monitored, obtain variation characteristic of the permeability with ess-strain, be aided with acoustic emission monitor(ing), to Behavior of Hardened Cement Paste internal structure change into
Row monitoring.Under different loading methods, when permeability is mutated or sound emission data substantially increase, illustrate that internal structure starts to become
Change, gas sealing ability starts to fail.This method is more accurate than conventional method, performance and formula design to cement sheath, live well
The guidance of cylinder operation is safer.
To achieve these goals, the technical solution adopted by the present invention is：A kind of cement sheath gas tightness failure judgement side
Method, comprises the following steps：
Step (1), determine stress point and dilatation yield stress point that Behavior of Hardened Cement Paste permeability is undergone mutation, determines gas tightness
Failpoint；
Step (2), simulate wellbore pressure change procedure, calculates cement sheath actual loading situation；
Step (3), contrasted above-mentioned result of calculation and experimental result, and it is airtight to judge whether cement sheath stress exceedes its
Envelope property failpoint；
Step (4), when determining that Behavior of Hardened Cement Paste fails, Behavior of Hardened Cement Paste overstrain value；
Step (5), simulate wellbore pressure change procedure, calculates cement sheath actual loading situation, and pressure break knot
Cement sheath overstrain situation after beam；
Step (6), contrasted result of calculation and experimental result, judge gas tightness whether safety.
Preferably, the stress point and dilatation yield stress that definite Behavior of Hardened Cement Paste permeability is undergone mutation in the step (1)
The method of point is to carry out three axis dullness loading experiments to scene formula Behavior of Hardened Cement Paste.
Any of the above-described scheme is preferably, and the method for the three axis dullness loading experiment includes：
A. inspection apparatus and pressure line, determine that equipment is normal；
B. sample is loaded；
C. edit and adjust computer control mode and corresponding protected mode, editor's experiment load mode；
D. equipment loading starts, while opens acoustic emission monitor(ing) equipment, experimentation medium while away from measurement core sample
The permeability of product；.
E. after testing, confined pressure, oil return booster, removal rock sample are unloaded.
Any of the above-described scheme is preferably, and the B., which loads sample, to be included：
A) plastic packaging sample；
B) deformeter is clamped, is put into pressure indoor, confined pressure cylinder and is positioned on cover；
Any of the above-described scheme is preferably, and permeability test and acoustic emission signal prison are carried out during the loading experiment
Survey, obtain mechanics parameter.
Any of the above-described scheme is preferably, and the mechanics parameter is included in Behavior of Hardened Cement Paste elasticity modulus, Poisson's ratio, cohesive strength
It is at least one.
Any of the above-described scheme is preferably, and gas tightness failpoint occurs being mutated and water for permeability in the step (1)
Mudstone outputs the minimum value of stress value when there is dilatation.
Any of the above-described scheme is preferably, before being simulated in the step (2) to wellbore pressure change procedure, including
Establish casing-cement sheath-stratum finite element model.Casing-cement sheath-stratum finite element model is using Finite Element Simulation Software
Establish common method during model.
Any of the above-described scheme is preferably, and described sleeve pipe-cement sheath-stratum finite element model is according to live stratum, water
What mudstone and sleeve parameters were established.
Any of the above-described scheme is preferably, and it is big at the scene that the step (2), which carries out wellbore pressure change procedure simulation,
Carried out under the conditions of scale pressure break.
Any of the above-described scheme is preferably, and judges whether cement sheath stress exceedes its gas tightness and lose in the step (3)
During effect point, if cement sheath stress exceedes gas tightness failpoint, gas tightness safety is judged, otherwise, it is determined that its gas tightness
Failure risk is high.
Any of the above-described scheme is preferably, and the step (4) determines that Behavior of Hardened Cement Paste overstrain value needs to be formulated water to scene
Mudstone carries out the experiment of three axis cyclic loading and unloadings.
Any of the above-described scheme is preferably, and adds and permeability test and acoustic emission signal monitoring are carried out in uninstall process, obtain
Mechanics parameter, determines stress point and dilatation yield stress point that Behavior of Hardened Cement Paste permeability is undergone mutation, airtight using smaller value as its
Envelope property failpoint.
Any of the above-described scheme is preferably, and the mechanics parameter is included in Behavior of Hardened Cement Paste elasticity modulus, Poisson's ratio, cohesive strength
It is at least one.
Any of the above-described scheme is preferably, and carrying out simulation to wellbore pressure change procedure in the step (5) needs to establish
Casing-cement sheath-stratum finite element model.
Any of the above-described scheme is preferably, described sleeve pipe-cement sheath-stratum finite element model need according to live stratum,
Behavior of Hardened Cement Paste and sleeve parameters are established.Model is made of stratum, cement sheath, casing, according to the property of different component in a model
Input different parameters.
Any of the above-described scheme is preferably, and the step (5) is that wellbore pressure under the conditions of live staged fracturing was changed
Cheng Jinhang is simulated.Wellbore pressure variation pattern is the input parameter of field engineering operation during staged fracturing, according to live work
Journey operation determines.
Any of the above-described scheme is preferably, and judges whether the specific method of safety is general to gas tightness in the step (6)
Result of calculation is contrasted with experimental result, judges whether cement sheath stress exceedes its gas tightness failpoint, overstrain amount
Whether overstrain value during its gas tightness failure is exceeded, if any one is not less than judgement gas tightness safety is no
Then, its gas tightness failure risk height is judged.Any one refers to whether cement sheath stress exceedes its gas tightness failpoint, residual
Whether remaining dependent variable exceedes the overstrain value during failure of its gas tightness.
According to Darcy's law, porous media, including Behavior of Hardened Cement Paste, have certain permeability：
In formula, v：Pass through the percolation flow velocity of seepage section, cm2/s；K：Porous media permeability, D (cm2)；μ：Fluid glues
Degree, mPa ﹒ s；ΔP：Seepage section pressure difference, 105Pa；ΔL：Seepage section distance, cm.So cement sheath is as porous media pair
The leakproofness of fluid is not 100% to insulate completely, but fluid is insulated under a kind of receptible degree.Behavior of Hardened Cement Paste
The increase of permeability is related to its degree of injury, and therefore, the sealing performance for evaluating cement sheath must be by Behavior of Hardened Cement Paste damage and permeability
Change be introduced into come, this also further demonstrate that the present invention method it is more accurate than conventional method.
Beneficial effect：
The beneficial effects of the invention are as follows：The present invention provides a kind of cement sheath gas tightness failure determination methods, including following
Step：
Step (1), determine stress point and dilatation yield stress point that Behavior of Hardened Cement Paste permeability is undergone mutation, determines gas tightness
Failpoint；
Step (2), simulate wellbore pressure change procedure, calculates cement sheath actual loading situation；
Step (3), contrasted above-mentioned result of calculation and experimental result, and it is airtight to judge whether cement sheath stress exceedes its
Envelope property failpoint；
Step (4), when determining that Behavior of Hardened Cement Paste fails, Behavior of Hardened Cement Paste overstrain value；
Step (5), simulate wellbore pressure change procedure, calculates cement sheath actual loading situation, and pressure break knot
Cement sheath overstrain situation after beam；
Step (6), contrasted result of calculation and experimental result, judge gas tightness whether safety.
The present invention has the following advantages：
The judgment criteria that the present invention fails Behavior of Hardened Cement Paste damage and permeability variation as its hermetic seal, to determine cement sheath
Gas tightness failure whether can occur, add unloading ess-strain experiment using three axis, permeability is monitored, obtains permeability
With the variation characteristic of ess-strain, it is aided with acoustic emission monitor(ing), Behavior of Hardened Cement Paste internal structure change is monitored.In different loading sides
Under formula, when permeability is mutated or sound emission data substantially increase, illustrate that internal structure starts to change, gas sealing ability starts to lose
Effect.This method is more accurate than conventional method, and performance and formula design to cement sheath, the guidance of live wellbore operations are safer.
Brief description of the drawings
Fig. 1 is the three axis load tests that the cement sheath gas tightness of the present invention fails used in one preferred embodiment of determination methods
Machine；
Fig. 2 loads Behavior of Hardened Cement Paste stress-strain diagram under different confined pressures to be dull；
Fig. 3 is bulk strain and permeability and acoustic emission signal relation；
Fig. 4 is Behavior of Hardened Cement Paste stress-strain diagram under CYCLIC LOADING；
Fig. 5 is bulk strain and permeability and acoustic emission signal relation；
Fig. 6, Fig. 6 A form for finite element model；Fig. 6 B establish for finite element model；
Fig. 7 is finite element simulation calculation result；
Three axis loading experiment of Fig. 8 Behavior of Hardened Cement Paste；
Fig. 9 single fracture simulation results；
Behavior of Hardened Cement Paste dilatancy under the conditions of Figure 10 cyclic loading and unloadings.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
To achieve these goals, the technical solution adopted by the present invention is：
Embodiment 1
As shown in Fig. 1-Fig. 9, cement sheath gas tightness failure determination methods, comprise the following steps：
Step (A1), be to determine cement sheath hermetic seal failure condition under the conditions of massive hydraulic fracture, and Behavior of Hardened Cement Paste is formulated to scene
Three axis dullness loading experiments are carried out, three axis dullness loading experiments are carried out using three axis loading testers as shown in Figure 1, three axis lists
Adjusting the method for loading experiment includes：
A. inspection apparatus and pressure line, determine that equipment is normal；
B. sample is loaded；
A) plastic packaging sample；
B) deformeter is clamped, is put into pressure indoor, confined pressure cylinder and is positioned on cover；
C. edit and adjust computer control mode and corresponding protected mode, editor's experiment load mode；
D. equipment loading starts, while opens acoustic emission monitor(ing) equipment, experimentation medium while away from measurement core sample
The permeability of product；.
E. after testing, confined pressure, oil return booster, removal rock sample are unloaded.
Permeability test and acoustic emission signal monitoring are carried out in loading procedure, Behavior of Hardened Cement Paste elasticity modulus, Poisson's ratio is obtained, glues
The mechanics parameters such as poly- power, determine stress point and dilatation yield stress point that Behavior of Hardened Cement Paste permeability is undergone mutation, using smaller value as
Its gas tightness failpoint.Gas tightness failpoint mutation occurs for permeability and the minimum of stress value during dilatation occurs in Behavior of Hardened Cement Paste
Value.
Dullness loads Behavior of Hardened Cement Paste stress-strain diagram under different confined pressures as shown in Fig. 2, bulk strain is sent out with permeability and sound
It is as shown in Figure 3 to penetrate signal relation.
Step (A2), according to live stratum, Behavior of Hardened Cement Paste and sleeve parameters establish casing-cement sheath-stratum finite element model,
Finite element model is formed and established as shown in fig. 6, wellbore pressure change procedure under the conditions of live massive hydraulic fracture is simulated,
Cement sheath actual loading situation is calculated, the results are shown in Figure 7 for finite element simulation calculation.
Step (A3), contrasted result of calculation and experimental result, judges whether cement sheath stress exceedes its hermetic seal
Property failpoint, if exceeding, judge gas tightness safety, otherwise, it is determined that its gas tightness failure risk is high.
Step (B1), be that cement sheath gas tightness failure condition, has determined that scene formula under the conditions of determining staged fracturing
Behavior of Hardened Cement Paste carries out the experiment of three axis cyclic loading and unloadings, monitors, obtains to carrying out permeability test and acoustic emission signal in loading procedure
The mechanics parameters such as Behavior of Hardened Cement Paste ess-strain, elasticity modulus, Poisson's ratio, cohesive strength, determine that Behavior of Hardened Cement Paste permeability undergos mutation should
Force and dilatation yield stress point (marking as shown in Figure 2 and Figure 3 a little), using smaller value as its gas tightness failpoint.Determine water
When mudstone fails, Behavior of Hardened Cement Paste overstrain value.Behavior of Hardened Cement Paste stress-strain diagram is as shown in Figure 4 under CYCLIC LOADING；Volume should
Become as shown in Figure 5 with permeability and acoustic emission signal relation；
Step (B2), according to live stratum, Behavior of Hardened Cement Paste and sleeve parameters establish casing-cement sheath-stratum finite element model,
Wellbore pressure change procedure under the conditions of live staged fracturing is simulated, calculates, obtains cement sheath actual loading situation, and
Cement sheath overstrain situation after pressure break.
Step (B3), contrasted result of calculation, judges whether cement sheath stress exceedes its gas tightness failpoint, residual
Whether remaining dependent variable exceedes the overstrain value during failure of its gas tightness, if above-mentioned any one is not less than judging airtight
Envelope property safety, otherwise, it is determined that its gas tightness failure risk is high.
Specifically, such as certain mouthful of well cement ring formula：+ 10% micro- cement water reducer of silicon+4% of+25% silica flour of G class g cements+
+ 0.2% defoamer of+1% cement dispersants of 1% cement retarder.
Three axis loading experiments are carried out to Behavior of Hardened Cement Paste, Behavior of Hardened Cement Paste dilatation yield stress is 47MPa under the formula, as shown in figure 8,
Under this stress value, cement sheath gas tightness is unaffected.
Finite element modelling as shown in Figure 6 is carried out to the well, single fracturing process is simulated, specific each structural parameters
As shown in table 1, in fracturing process, wellbore pressure value added scope is 65~80MPa, accordingly, to area's shale gas well fracturing and
Note adopts process and carries out finite element modelling, and analog result is as shown in figure 9, according to analog result, during the entire process of single pressure break,
Maximum stress suffered by cement sheath is 39MPa, without the risk of air-tightness failure.
Each structure design parameter of 1 finite element modelling of table is set
Embodiment 2
A kind of cement sheath gas tightness failure determination methods, and unlike embodiment 1, embodiment 2 is to massive hydraulic fracture
Process is simulated.
10 fracturing process are carried out using Fig. 1 shown devices and to Behavior of Hardened Cement Paste, to this to the water under the conditions of same recipe
Mudstone carries out the stress point that cyclic loading and unloading experiment determines the failure of its gas tightness, as shown in Figure 10, test result indicates that following
Ring adds under unloading condition, and dilatation occurs in second of cyclic process for Behavior of Hardened Cement Paste, and Behavior of Hardened Cement Paste gas tightness is affected, and the
Dilatation point stress is 35MPa in secondary cycle.
According to the simulation result of calculation of embodiment 1, the stress value that cement sheath is subject in fracturing process exceedes this value, cement sheath
The risk of gas tightness failure can occur under working condition.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should be covered by the protection scope of the present invention.
Claims (10)
- The determination methods 1. a kind of cement sheath gas tightness fails, it is characterised in that comprise the following steps：Step（1）, determine stress point and dilatation yield stress point that Behavior of Hardened Cement Paste permeability is undergone mutation, determine gas tightness fail Point；Step（2）, wellbore pressure change procedure is simulated, calculate cement sheath actual loading situation；Step（3）, above-mentioned result of calculation and experimental result contrasted, judge whether cement sheath stress exceedes its gas tightness Failpoint；Step（4）, when determining that Behavior of Hardened Cement Paste fails, Behavior of Hardened Cement Paste overstrain value；Step（5）, wellbore pressure change procedure is simulated, cement sheath actual loading situation is calculated, and after pressure break Cement sheath overstrain situation；Step（6）, result of calculation and experimental result contrasted, judge gas tightness whether safety.
- A kind of 2. cement sheath gas tightness failure determination methods according to claim 1, it is characterised in that the step （1）In determine that the method for the stress point undergone mutation of Behavior of Hardened Cement Paste permeability and dilatation yield stress point is to be formulated Behavior of Hardened Cement Paste to scene Carry out three axis dullness loading experiments.
- 3. a kind of cement sheath gas tightness failure determination methods according to claim 2, it is characterised in that the loading is real Permeability test and acoustic emission signal monitoring are carried out during testing, obtains mechanics parameter.
- A kind of 4. cement sheath gas tightness failure determination methods according to claim 1, it is characterised in that the step （1）Middle gas tightness failpoint mutation occurs for permeability and Behavior of Hardened Cement Paste outputs the smaller value of stress value when there is dilatation.
- A kind of 5. cement sheath gas tightness failure determination methods according to claim 1, it is characterised in that the step （2）In wellbore pressure change procedure is simulated before, including establish casing-cement sheath-stratum finite element model.
- A kind of 6. cement sheath gas tightness failure determination methods according to claim 1, it is characterised in that the step （3）It is middle when judging whether cement sheath stress exceedes its gas tightness failpoint, if cement sheath stress exceedes gas tightness failpoint, Gas tightness safety is then judged, otherwise, it is determined that its gas tightness failure risk is high.
- A kind of 7. cement sheath gas tightness failure determination methods according to claim 1, it is characterised in that the step （4）Determine that Behavior of Hardened Cement Paste overstrain value needs to carry out the experiment of three axis cyclic loading and unloadings to scene formula Behavior of Hardened Cement Paste.
- 8. a kind of cement sheath gas tightness failure determination methods according to claim 7, it is characterised in that add uninstall process Middle progress permeability test and acoustic emission signal monitoring, obtain Behavior of Hardened Cement Paste mechanics parameter, determine that Behavior of Hardened Cement Paste permeability is undergone mutation Stress point and dilatation yield stress point, using smaller value as its gas tightness failpoint.
- A kind of 9. cement sheath gas tightness failure determination methods according to claim 1, it is characterised in that the step （5）In wellbore pressure change procedure is carried out simulation need to establish casing-cement sheath-stratum using Finite Element Simulation Software it is limited Meta-model.
- A kind of 10. cement sheath gas tightness failure determination methods according to claim 1, it is characterised in that the step （6）It is middle to judge whether the specific method of safety for result of calculation and experimental result are contrasted, judges cement sheath to gas tightness Whether stress exceedes overstrain value when whether its gas tightness failpoint, overstrain amount exceed the failure of its gas tightness, If any one in air-tightness failpoint stress and the larger stress value of overstrain amount is not less than judging gas tightness peace Entirely, otherwise, it is determined that its gas tightness failure risk is high.
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|---|---|---|---|---|
| CN109991314A (en) * | 2019-03-11 | 2019-07-09 | 清华大学 | Mechanical seal state judging method, device based on machine learning |
| CN112196522A (en) * | 2019-06-20 | 2021-01-08 | 中石化石油工程技术服务有限公司 | Method for reducing gas well annular control pressure under alternating load effect |
| CN113008675A (en) * | 2021-03-01 | 2021-06-22 | 浙江科技学院 | Detection method for bonding failure of undisturbed sand |
| CN114076820A (en) * | 2020-08-13 | 2022-02-22 | 中国石油天然气集团有限公司 | Test method for measuring Biot coefficient of cement stone |
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